Merge pull request #330 from gnodet/i276

Do not run server threads as daemon as it causes problems with the exec-maven-plugin (#276)

daemon/src/main/java/org/mvndaemon/mvnd/daemon/Server.java

@@ -214,7 +214,6 @@ public class Server implements AutoCloseable, Runnable {
     static class DaemonThread extends Thread {
         public DaemonThread(Runnable target) {
             super(target);
-            setDaemon(true);
         }
     }